Year	metric tons
1960	180
1961	194
1962	211
1963	222
1964	194
1965	205
1966	335
1967	304
1968	354
1969	416
1970	871
1971	1060
1972	1419
1973	3264
1974	3881
1975	5826
1976	6527
1977	9040
1978	12358
1979	16430
1980	26065
1981	35038
1982	51765
1983	65586
1984	71791
1985	75945
1986	91171
1987	129660
1988	162421
1989	184048
1990	221131
1991	296703
1992	339795
1993	340758
1994	406911
1995	467666
1996	622396
1997	737234
1998	754536
1999	734469
2000	839469
2001	1105950
2002	1174421
2003	1234730
2004	1382197.5
2005	1500649.5
2006	1687454.24
2007	1670203.5400000003
2008	1804087.7799999998
2009	1881564.23
2010	1836973.36
2011	2198581.67
2012	2363998.8
2013	2373013.7800000003
2014	2770001.6399999997
2015	2646425.95
2016	2657992.41
2017	2941939.4699999997
2018	3187640.6600000006
2019	3567444.06
2020	3812573.3
2021	3827708.9199999995
2022	4245073.430000001